Latest on the trial of the -- tall doctor accused of murdering his wife his former mistress expected to take the stand again tomorrow. The prosecution says Martin McBeal won -- his wife out of the way so he could be with her ABCs -- Roy has the story. My name is Gypsy -- she is the other woman. We are involved a number of years ago. In the trial of Martin McNeal a former U -- edition -- Prosecutors say -- kill his wife Michelle so he could continue his affair with his purported mistress I had an interest. Ford weren't posted things -- -- -- -- -- it was instant messenger he replied. Torn of their subjects supposed to hit the relationship become sexual Pickett and how often were the -- view having sexual relations. We would see each other about a couple times a month I think we probably had sex half the time I mean sometimes it was just lunch. Willis testified Friday that -- gave her a debit card helped pay for her nursing program even moving her into a nearby apartment so he's paying for the housing. Yes prosecutors argue that -- gave his wife and lethal dose of painkillers while she was recovering from plastic surgery. A face -- the prosecutors say he insisted she half. McNeal maintains his innocence his attorneys say Michelle died of a heart condition. I understand this. Martin's wife was found collapsed at least he -- -- resuscitate her she was taken to hospital. Coated in and customer -- invited his lover to his wife's funeral -- you speak to the defendant at the funeral. -- a spokesman brief Fiat after -- just said so I hope your own rights and if there's anything I can do -- amino. According to the prosecution -- eventually moved north into his home as -- live in nanny was there any question you're going to be hired as the nanny. I don't believe that -- would have had me come and help -- his children had objected strongly to me. Willis says her relationship with McNeil is now over. But the two will face each other again when Willis continues on the stand tomorrow. And for Good Morning America a Deedee Roy ABC news Los Angeles.

This transcript has been automatically generated and may not be 100% accurate.

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